Limits — Syllabus
ICSE · Class 11 · Mathematics
What Limits covers in ICSE Class 11 Mathematics: 4 topics, for the 2026-27 session. Part of the ICSE Class 11 Mathematics syllabus.
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Topics in Limits
1. Core Idea of Limit
- A limit describes the value a function approaches as x approaches a number c.
- Limit is written as lim_{x->c} f(x).
- A real number can be approached very closely without being exactly equal to it.
2. Algebra of Limits
- Limits follow sum, difference, product, and quotient rules.
- These rules apply when the individual limits exist.
- For the quotient rule, the denominator limit must not be zero.
3. Methods for Evaluating Algebraic Limits
- Direct substitution works when the function is defined at the point.
- Factorisation is used mainly when substitution gives 0/0 form.
- Rationalisation is used when square roots are involved.
4. Standard Trigonometric Limits and Their Use
- The key trigonometric limit is lim_{x->0}(sin x/x) = 1.
- Another standard limit is lim_{x->0}((1-cos x)/x) = 0.
- Also, lim_{x->0}(tan x/x) = 1.
Key Concepts
Central concept: The limit of a function as the variable approaches a point
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